diff --git a/Cargo.lock b/Cargo.lock
index 9e689e3..b12d243 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -71,6 +71,67 @@ version = "0.8.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
 
+[[package]]
+name = "equivalent"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
+
+[[package]]
+name = "futures-core"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05f29059c0c2090612e8d742178b0580d2dc940c837851ad723096f87af6663e"
+
+[[package]]
+name = "futures-macro"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "162ee34ebcb7c64a8abebc059ce0fee27c2262618d7b60ed8faf72fef13c3650"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "futures-task"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f90f7dce0722e95104fcb095585910c0977252f286e354b5e3bd38902cd99988"
+
+[[package]]
+name = "futures-timer"
+version = "3.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f288b0a4f20f9a56b5d1da57e2227c661b7b16168e2f72365f57b63326e29b24"
+
+[[package]]
+name = "futures-util"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9fa08315bb612088cc391249efdc3bc77536f16c91f6cf495e6fbe85b20a4a81"
+dependencies = [
+ "futures-core",
+ "futures-macro",
+ "futures-task",
+ "pin-project-lite",
+ "pin-utils",
+ "slab",
+]
+
+[[package]]
+name = "glob"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a8d1add55171497b4705a648c6b583acafb01d58050a51727785f0b2c8e0a2b2"
+
+[[package]]
+name = "hashbrown"
+version = "0.15.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5971ac85611da7067dbfcabef3c70ebb5606018acd9e2a3903a0da507521e0d5"
+
 [[package]]
 name = "iana-time-zone"
 version = "0.1.63"
@@ -95,6 +156,16 @@ dependencies = [
  "cc",
 ]
 
+[[package]]
+name = "indexmap"
+version = "2.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cea70ddb795996207ad57735b50c5982d8844f38ba9ee5f1aedcfb708a2aa11e"
+dependencies = [
+ "equivalent",
+ "hashbrown",
+]
+
 [[package]]
 name = "js-sys"
 version = "0.3.77"
@@ -145,9 +216,31 @@ dependencies = [
  "chrono",
  "num-traits",
  "regex",
+ "rstest",
  "winnow",
 ]
 
+[[package]]
+name = "pin-project-lite"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b3cff922bd51709b605d9ead9aa71031d81447142d828eb4a6eba76fe619f9b"
+
+[[package]]
+name = "pin-utils"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
+
+[[package]]
+name = "proc-macro-crate"
+version = "3.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "edce586971a4dfaa28950c6f18ed55e0406c1ab88bbce2c6f6293a7aaba73d35"
+dependencies = [
+ "toml_edit",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.95"
@@ -195,18 +288,75 @@ version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2b15c43186be67a4fd63bee50d0303afffcef381492ebe2c5d87f324e1b8815c"
 
+[[package]]
+name = "relative-path"
+version = "1.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba39f3699c378cd8970968dcbff9c43159ea4cfbd88d43c00b22f2ef10a435d2"
+
+[[package]]
+name = "rstest"
+version = "0.25.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6fc39292f8613e913f7df8fa892b8944ceb47c247b78e1b1ae2f09e019be789d"
+dependencies = [
+ "futures-timer",
+ "futures-util",
+ "rstest_macros",
+ "rustc_version",
+]
+
+[[package]]
+name = "rstest_macros"
+version = "0.25.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1f168d99749d307be9de54d23fd226628d99768225ef08f6ffb52e0182a27746"
+dependencies = [
+ "cfg-if",
+ "glob",
+ "proc-macro-crate",
+ "proc-macro2",
+ "quote",
+ "regex",
+ "relative-path",
+ "rustc_version",
+ "syn",
+ "unicode-ident",
+]
+
+[[package]]
+name = "rustc_version"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfcb3a22ef46e85b45de6ee7e79d063319ebb6594faafcf1c225ea92ab6e9b92"
+dependencies = [
+ "semver",
+]
+
 [[package]]
 name = "rustversion"
 version = "1.0.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eded382c5f5f786b989652c49544c4877d9f015cc22e145a5ea8ea66c2921cd2"
 
+[[package]]
+name = "semver"
+version = "1.0.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56e6fa9c48d24d85fb3de5ad847117517440f6beceb7798af16b4a87d616b8d0"
+
 [[package]]
 name = "shlex"
 version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
 
+[[package]]
+name = "slab"
+version = "0.4.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04dc19736151f35336d325007ac991178d504a119863a2fcb3758cdb5e52c50d"
+
 [[package]]
 name = "syn"
 version = "2.0.101"
@@ -218,6 +368,23 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "toml_datetime"
+version = "0.6.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22cddaf88f4fbc13c51aebbf5f8eceb5c7c5a9da2ac40a13519eb5b0a0e8f11c"
+
+[[package]]
+name = "toml_edit"
+version = "0.22.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41fe8c660ae4257887cf66394862d21dbca4a6ddd26f04a3560410406a2f819a"
+dependencies = [
+ "indexmap",
+ "toml_datetime",
+ "winnow",
+]
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.18"
diff --git a/Cargo.toml b/Cargo.toml
index 2f0013f..55df981 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,3 +13,6 @@ regex = "1.10.4"
 chrono = { version="0.4.38", default-features=false, features=["std", "alloc", "clock"] }
 winnow = "0.7.10"
 num-traits = "0.2.19"
+
+[dev-dependencies]
+rstest = "0.25"
diff --git a/tests/common/mod.rs b/tests/common/mod.rs
new file mode 100644
index 0000000..6956e99
--- /dev/null
+++ b/tests/common/mod.rs
@@ -0,0 +1,24 @@
+use chrono::{DateTime, FixedOffset};
+use parse_datetime::{parse_datetime, parse_datetime_at_date};
+
+pub fn check_absolute(input: &str, expected: &str) {
+    let parsed = match parse_datetime(input) {
+        Ok(v) => v,
+        Err(e) => panic!("Failed to parse date from value '{input}': {e}"),
+    };
+
+    assert_eq!(
+        &parsed.to_rfc3339().replace("T", " "),
+        expected,
+        "Input value: {input}"
+    );
+}
+
+pub fn check_relative(now: DateTime<FixedOffset>, input: &str, expected: &str) {
+    let parsed = match parse_datetime_at_date(now.into(), input) {
+        Ok(v) => v,
+        Err(e) => panic!("Failed to parse date from value '{input}': {e}"),
+    };
+    let expected_parsed = DateTime::parse_from_rfc3339(expected).unwrap();
+    assert_eq!(parsed, expected_parsed, "Input value: {input}");
+}
diff --git a/tests/date.rs b/tests/date.rs
new file mode 100644
index 0000000..ba8ef53
--- /dev/null
+++ b/tests/date.rs
@@ -0,0 +1,92 @@
+use rstest::rstest;
+
+mod common;
+use common::check_absolute;
+
+// The expected values are produced by GNU date version 8.32
+// export LC_TIME=en_US.UTF-8
+// export TZ=UTC
+// date --rfc-3339=seconds --date="2022-11-14"
+//
+// Documentation for the date format can be found at:
+// https://www.gnu.org/software/coreutils/manual/html_node/Calendar-date-items.html
+
+#[rstest]
+#[case::iso8601("2022-11-14", "2022-11-14 00:00:00+00:00")]
+#[case::short_year_22("22-11-14", "2022-11-14 00:00:00+00:00")]
+#[case::short_year_68("68-11-14", "2068-11-14 00:00:00+00:00")]
+#[case::short_year_00("00-11-14", "2000-11-14 00:00:00+00:00")]
+#[case::short_year_69("69-11-14", "1969-11-14 00:00:00+00:00")]
+#[case::short_year_99("99-11-14", "1999-11-14 00:00:00+00:00")]
+#[case::us_style("11/14/2022", "2022-11-14 00:00:00+00:00")]
+#[case::us_style_short_year("11/14/22", "2022-11-14 00:00:00+00:00")]
+#[case::year_zero("0000-01-01", "0000-01-01 00:00:00+00:00")]
+#[case::year_001("001-11-14", "0001-11-14 00:00:00+00:00")]
+#[case::year_100("100-11-14", "0100-11-14 00:00:00+00:00")]
+#[case::year_999("999-11-14", "0999-11-14 00:00:00+00:00")]
+#[case::year_9999("9999-11-14", "9999-11-14 00:00:00+00:00")]
+/** TODO: https://github.com/uutils/parse_datetime/issues/160
+#[case::year_10000("10000-12-31", "10000-12-31 00:00:00+00:00")]
+#[case::year_100000("100000-12-31", "100000-12-31 00:00:00+00:00")]
+#[case::year_1000000("1000000-12-31", "1000000-12-31 00:00:00+00:00")]
+#[case::year_10000000("10000000-12-31", "10000000-12-31 00:00:00+00:00")]
+#[case::max_date("2147485547-12-31", "2147485547-12-31 00:00:00+00:00")]
+**/
+#[case::long_month_in_the_middle("14 November 2022", "2022-11-14 00:00:00+00:00")]
+#[case::long_month_in_the_middle_lowercase("14 november 2022", "2022-11-14 00:00:00+00:00")]
+#[case::long_month_in_the_middle_uppercase("14 NOVEMBER 2022", "2022-11-14 00:00:00+00:00")]
+#[case::short_month_in_the_middle("14 nov 2022", "2022-11-14 00:00:00+00:00")]
+#[case::short_month_in_the_uppercase("14 NOV 2022", "2022-11-14 00:00:00+00:00")]
+#[case::long_month_in_the_middle_hyphened("14-november-2022", "2022-11-14 00:00:00+00:00")]
+#[case::long_month_in_the_middle_nospace("14november2022", "2022-11-14 00:00:00+00:00")]
+#[case::short_month_in_the_middle_hyphened("14-nov-2022", "2022-11-14 00:00:00+00:00")]
+#[case::short_month_in_the_middle_nospace("14nov2022", "2022-11-14 00:00:00+00:00")]
+#[case::long_month_at_start("November 14 2022", "2022-11-14 00:00:00+00:00")]
+#[case::long_month_at_start_with_comma("November 14, 2022", "2022-11-14 00:00:00+00:00")]
+#[case::short_month_at_start("nov 14 2022", "2022-11-14 00:00:00+00:00")]
+#[case::long_month_in_the_middle_jan("14 January 2022", "2022-01-14 00:00:00+00:00")]
+#[case::long_month_in_the_middle_feb("14 February 2022", "2022-02-14 00:00:00+00:00")]
+#[case::long_month_in_the_middle_mar("14 March 2022", "2022-03-14 00:00:00+00:00")]
+#[case::long_month_in_the_middle_apr("14 April 2022", "2022-04-14 00:00:00+00:00")]
+#[case::long_month_in_the_middle_may("14 May 2022", "2022-05-14 00:00:00+00:00")]
+#[case::long_month_in_the_middle_jun("14 June 2022", "2022-06-14 00:00:00+00:00")]
+#[case::long_month_in_the_middle_jul("14 July 2022", "2022-07-14 00:00:00+00:00")]
+#[case::long_month_in_the_middle_aug("14 August 2022", "2022-08-14 00:00:00+00:00")]
+#[case::long_month_in_the_middle_sep("14 September 2022", "2022-09-14 00:00:00+00:00")]
+#[case::long_month_in_the_middle_oct("14 October 2022", "2022-10-14 00:00:00+00:00")]
+#[case::long_month_in_the_middle_dec("14 December 2022", "2022-12-14 00:00:00+00:00")]
+#[case::short_month_in_the_middle_jan("14 jan 2022", "2022-01-14 00:00:00+00:00")]
+#[case::short_month_in_the_middle_feb("14 feb 2022", "2022-02-14 00:00:00+00:00")]
+#[case::short_month_in_the_middle_mar("14 mar 2022", "2022-03-14 00:00:00+00:00")]
+#[case::short_month_in_the_middle_apr("14 apr 2022", "2022-04-14 00:00:00+00:00")]
+#[case::short_month_in_the_middle_may("14 may 2022", "2022-05-14 00:00:00+00:00")]
+#[case::short_month_in_the_middle_jun("14 jun 2022", "2022-06-14 00:00:00+00:00")]
+#[case::short_month_in_the_middle_jul("14 jul 2022", "2022-07-14 00:00:00+00:00")]
+#[case::short_month_in_the_middle_aug("14 aug 2022", "2022-08-14 00:00:00+00:00")]
+#[case::short_month_in_the_middle_sep("14 sep 2022", "2022-09-14 00:00:00+00:00")]
+#[case::short_month_in_the_middle_sept("14 sept 2022", "2022-09-14 00:00:00+00:00")]
+#[case::short_month_in_the_middle_oct("14 oct 2022", "2022-10-14 00:00:00+00:00")]
+#[case::short_month_in_the_middle_dec("14 dec 2022", "2022-12-14 00:00:00+00:00")]
+fn test_absolute_date_numeric(#[case] input: &str, #[case] expected: &str) {
+    check_absolute(input, expected);
+}
+
+#[rstest]
+#[case::us_style("11/14", 2022, "2022-11-14 00:00:00+00:00")]
+#[case::aphabetical_full_month_in_front("november 14", 2022, "2022-11-14 00:00:00+00:00")]
+#[case::aphabetical_full_month_at_back("14 november", 2022, "2022-11-14 00:00:00+00:00")]
+#[case::aphabetical_short_month_in_front("nov 14", 2022, "2022-11-14 00:00:00+00:00")]
+#[case::aphabetical_short_month_at_back("14 nov", 2022, "2022-11-14 00:00:00+00:00")]
+#[case::aphabetical_full_month_in_front("november 14", 2022, "2022-11-14 00:00:00+00:00")]
+#[case::aphabetical_full_month_at_back("14 november", 2022, "2022-11-14 00:00:00+00:00")]
+#[case::aphabetical_short_month_in_front("nov 14", 2022, "2022-11-14 00:00:00+00:00")]
+#[case::aphabetical_short_month_at_back("14 nov", 2022, "2022-11-14 00:00:00+00:00")]
+#[case::aphabetical_long_month_at_back_hyphen("14-november", 2022, "2022-11-14 00:00:00+00:00")]
+#[case::aphabetical_short_month_at_back_hyphen("14-nov", 2022, "2022-11-14 00:00:00+00:00")]
+fn test_date_ommititing_year(#[case] input: &str, #[case] year: u32, #[case] expected: &str) {
+    use chrono::DateTime;
+    use common::check_relative;
+
+    let now = DateTime::parse_from_rfc3339(&format!("{year}-06-01T00:00:00+00:00")).unwrap();
+    check_relative(now, input, expected);
+}
diff --git a/tests/simple.rs b/tests/simple.rs
deleted file mode 100644
index 8b13789..0000000
--- a/tests/simple.rs
+++ /dev/null
@@ -1 +0,0 @@
-